Drill.



B111- CORTINAS.

DR1LL.

. APPLIQATION FILED 001230, 1911A. 1,13%,491 1 Patented June 11, 1912.

2 SHBBTS-SHBET 1.

Mmes/QQ i y i 1 E. F. CORTINAS..

h DRILL. APPLIUTION FILED OUT. 30, 1911.

3429941 o Patented June 11, 1912.

2 SHEETS-SHBBT 2.

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f invirnn s'rafrns ra'rnn'r orrion.

EUGENIO F. CORTINAS, OF BREAUX BRIDGE, LOUISIANA. i

' 4 To all whom it may concern:

Beit known that I, EUGENIO F. CORTINAS, a citizen of the United States, residing .at Breaux Bridge, in the parish of St. Martin, State of Louisiana, have invented certain newrand useful Improvements inDrills; and I do hereby declare the following to be a fulhclear, and exact description of the invention, such as'will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to drills and particularly that type designed for use in boring il and water wells of great depth.

The object of the invention resides in the provision of a drill of the character named which includes a plurality `of bits each of which latter-is provided with a plurality of cutting blades adapted to be successively presented for use as the bladesbecome dull as a result of the boring operation, said bits being so constructed and arranged that the blades thereof may be moved into active position successively without the necessity of ligfithdrawing the drill and tubing from the ore.

A further object ofthe invention resides in the provision of a drill ofthe character referred to which will obviate the necessity of frequent sharpening and thereby greatly reduce the time necessary to complete the bore and of course the exp-ense incident t0 the work.

IVith the above and other objects in view, the invention consists in the details of construction and in th-e arrangement and combination of parts to be hereinafter more fully described and particularly pointed out in the appended claims. I

In describing the invention in detail, reference will be had to the accompanying drawings, wherein like characters of reference denote corresponding parts in the several views, and in which- Figure 1 is a view in elevation of a drill constructed in accordance with the invention, Fig. 2, an elevation of the drill viewed at right angle to Fig. 1, Fig. 3, ar bottom View of the drill, Fig. 4, a section on the line 4.-4 of Fig. 3, Fig. 57 a section on the line 5 5 of Fig. 3, Fig. 6,'a view in elevation lshowing a position assumed by the parts of the drill during the rotation of the bits to bring a sharp blade into active position, and Fig. 7 a detail perspective view .sition.

Patented J une 11 1912. serian No. 657,637.

of one of the yielding bit locks employed in the drill.

Referring to the drawings, the drill is shown as comprising a body or head 10 of cylindrical formation and having its upper end provided with threads 11 for engaging the threads of the lower Vend of the tubing 12. The lower end of the body 10 terminates in a drill point 13 and is further provided with a pa'ir of longitudinal passages 14, the lower ends of which latter are disposed respectively on opposite sides of the point 13. conduit for the water which is supplied through the tubing 12 during the operation of drilling. i

Extending transversely through the drill point 13 is a rotatable shaftI 15 on one end of which is fixed a bit 16 having a plurality of cutting blades 17, so positioned that as the shaft 15 is rotated said blades will be disposed successively in their lowermost or active position. Loosely mounted on the end of the shaft 15 opposite to the bit 16 is another bit 18 having a plurality of cutting blades 19 so positioned that the rotation of said bit will successively dispose said blades in'their` lowermost or active pothe body 10 above the. bits 16 and 18 are These passages 14 serve as a,

Extending longitudinally through 1 passages 20 and 21; respectively in which are slidably mounted respectively rods 23 and 24. The lower ends of these rods are disposed without respective passages 20 and 21 and are provided with enlarged heads 25 and 26 respectively. The head 25 is provided with a beveled edge 27 adapted to engage'the rear portion ofone of the inactively disposed blades of the bit 18` to form a stop for preventing the rotation of the bit during the boring operation.

It will be noted that the head 25 and beveled edge 27 are'so positioned with respect to the bit 18 that the tendency of said bit to rotate during the boring operation will serve to intensify the locking engagement between the head and bit. Likewise the head 26 is provided with a beveled edge 28 adapted to engage the rear portion of one ofthe inactively disposed blades of the bit 16 to form a stop for preventing the rotation of the bit 16 during the boring operation. The position of the beveled edge 2S with respect to the bit,16 is such that the tendency of said bit to rotate during the boring operation will intensify the looking engagement between the head 26 and v the bit 16. The passages 20 and 21 have '30 and a coil spring 81, said balls being disposed respectively against the lower ends of the plugs 29 and forming a bearing respectively for the upper ends of the coil springs 31, said springs bearing at their' lower ends against the upper ends `f respective rods 23 and 24. By this construction it will be apparent that the springs 31' constantly tend to yieldingly hold the `heads 25 and 26 into engagement with respective bits 16 and 18 so as to positively lock the latter against rotation during the boring operation in the manner previously referred to. The tension of the spring 31 may be varied when desired by manipulating the plugs 29 as will be apparent.

In use the drill is operated until the lowermost blades of respective bits 1 6 and 18 become too dull for further use. The drill is then elevated in the bore and allowed to drop sharply against the end of the bore. After this is done the drill is rotated to the left Vand this rotation will cause the bits 16 and 18 to in turn rotate so as to lift ,the heads 25 Aand 26-and result in the presentation of a sliarp blade on each bit in active position'when the heads 25 and 26 will be operated by the springs 31 to locking position so-as toprevent the reverse rotation of the bits 16 and 18v during the normal operation of the drill.

What is claimed is: 1. A drill comprising a rotary head having its lower endterminating in a drill point, a shaft rotatably mounted in sa-id drill point and extending transversely -of during the normal operation of the drill to maintain a given blade thereof in active position, said locking means being movable under the7 inliuenee of a predetermined movement of the drill'while the bit is disposed in engagement with the material rbeing operated upon to permit the rotation of the bit.

2. A drill comprising a rotary head, a bit provided with a plurality of cutting blades rotatably mounted on the head with its axis of rotation disposed at right angles to the axis of rotation of the head, saidl biades being adapted to .be disposed successively in active position by the rotation of ythe bit, and means for locking said bit against rotation during the normal operation of the drill to maintain a given blade thereof inv active position, said locking means being movable when'a predetermined movement is imparted to the drill while the bit is disposed in engagement with the material being operated upon to permit the rotation of the-bit.,

3. A drill comprising a head having a reduced lower end, a shaft rotatably mounted in said reduced lower end and extending transversely ofthe head, a, rotatable bit having a plurality of cutting blades supported by said shaft on each side of the reduced lower end of the head, yielding locking means for each bit for securing vsame against rotation during the normal .operation of the drill to maintain a given blade thereofin active position, said means comprising a rod slidable in said head having an enlarged lower end adaptedY to engage the adjacent bit, and a spring constantly tending to move said rod so as to force the enlarged lower end into engagement with the adjacent bit, said rod being movable against the influence of said spring when a vpredetermined movement. is impart- `ed to the drill while the bit is disposed in engagement with the material being operated upon to permit the rotation of the bit in one direction.

In testimony whereof, I atlix my signature, in presence of two witnesses.

EUGENIO F. CORTINAS.

Witnesses:

J. B. PATIN, FELIX BELLOT. 

